Python

1 Variable

Variable is used to store data in a program and are used in operations and expression. With slight difference in the syntax. 

2 Number

One of the data type python support is number. The numbers are classified as integer, float and complex numbers.

3 String

String is a sequence of characters. It is used to store textual data in a program.

4 Boolean

Boolean is one of the data type supported by python. The Boolean data type represent true or false that produced by an expression.

5 Decision

A decision statement is used to control how the program behave under different conditions. Conditions are an expression that returns true or false value.

6 Loop

Loop or repetition statement are used to repeat a block of codes until the stopping condition is fulfilled. Also called iterative statement.

7 Function

Function is a block of code that perform a task when called using its name. Function also takes in data to be processed and may returns a result at the end.

8 List

List is one of the data type in python. A list is a object to store a sequence of data that are modifiable. Although fundamentally similar to an array, a list can contain data of different type.

9 Tuple

A tuple is similar to a list, but they are used to store a sequence of data that are not modifiable. Both list and tuple has same functions, except tuple don't have function that modifies its content.

10 Set

A set store unordered collection of data under a single variable. Set are non-modifiable and are not indexed. Two elements stored in a set cannot have a duplicate.

11 Dictionary

Dictionary is used to store key-value pairs. It is a ordered item that uses key to refer it's individual data. After a dictionary is created we can add, update or remove the elements by using its methods.

12 Output in Python

To display text on the console using print() function and get to know its parameters. Also explore how the strings are formatted before they are displayed.

Object Oriented Programming in Python

13 Class and Object

Class is a logical grouping of data and function defined by user. Class definition is used by python to create an objects. Each object has its own attributes and behaviors.

14 Inheritance

Inheritance is deriving a new class from an existing class. Derived class or child class inherits attributes and methods from Base class or also known as Parent class.

15 Encapsulation

Encapsulation is process of wrapping attributes and methods together as a single unit. The attributes are well hidden from outside class only only way to access them is through methods in that class.

16 Polymorphism

Polymorphism is characteristic shown by an object to take more than one form.

17 Abstraction

Abstraction basic implementation of a function is hidden from user. The user can only view basic functionalities while its internal details are hidden.

Others topics

18 Module

In python, a file saved with .py extension is called module. So in a module we may define a class, data fields and functions.

19 Exception

An exception is an unplanned event that occurs during program execution that disrupts the normal flow of a program.

File i/O

Data displayed in console are not saved and cannot be retrieved once the program is closed. To save the data, it have to be stored inside of a file.

Comments

Post a Comment

Popular posts from this blog

Drawing Simple Pie Chart

Image
To draw pie chart with 5 sectors. The program calculates the total of all the input given by user and find the angle in degrees to draw each sectors. When the program first loads, chart based on default values is painted by the program. User can edit the values in the text field and presses draw button to redraw the chart. Each time the draw button is pressed, new set of angle is calculated and repainted. I have attached the the sources for this program. It is simple and needs upgrades. Pie.java This class executed the program and initializes the components JTextField and JPanel to draw the chart. package coolApp.graphics; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Pie { JTextField a,b,c,d,e; JButton btnDraw; double total; JPanel contentPane; Pie(){ JFrame frame = new JFrame("Pie - CoolApps"); frame.setSize(500,500); contentPane = new JPanel(); contentPane.setLayout(new BorderLayout()); frame
Read more

VB.net connecting to SQL Server

Connecting to SQL server 2014 from VB.Net 2017, read values from the database and display the data in windows form. Before begin to write this program, first we need to import SqlClient class. Imports System.Data.SqlClient Step 1 Create a sql connection object. This is to make connection to object. Dim conn As New SqlConnection() Step 2 Set the connection string to the sqlconnection object: conn.ConnectionString = connStr Road block The variable connStr is a connection string. Connection object need connection string to make connection to database. It has information like who providing the database, the name of the database and some security information. Dim connStr As String = "Data Source = ServerInstanceName;Initial Catalog=testDB;Integrated Security=True" Let's break down the connection string into the three main components. Dim provider As String = "ServerInstanceName;" Dim database As String = "Initial Catalog=testDB;" Dim
Read more

VB.net

a quick and convenient way to build a window based application. basically there is two main components in VB, the design view where we place the controls on a window form. then we have the code view where we write implementation for each controls on the form. Typically the control implementation or procedures are executed when certain events happens to the controls. Events like mouse click, or value change on text box, form load, form close and so on. After working with programming language like C, C++ and Java, getting use to VB is a bit challenging. its because first of all, VB don't use curly bracket to specify code blocks, and the statements don't end with semicolon. variable declaration for example is written as dim age As Integer in C, C++ and Java it written int age; in VB, variable declaration start with dim keyword, it means dimension and the functions are written as Function addNumber(ByVal num1 As Integer, ByVal num2 As Integer) As Integer addNumber
Read more